<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-7ymO4nGrkm372HoSbq1OY2DP4pEZnMiA+E0F3zPr+JQQtQ82gQ1HPY3QIVtztVua" crossorigin="anonymous"></script>

    <style>
       .first{
        width: 500px;
        /* height: 1000px; */
        margin: 0 auto;
       }
       .a btn btn-primary{
            margin-left: 500px;
       }
    </style>
</head>
<body>
    <div class="first">
        <nav class="navbar navbar-expand-lg navbar-light bg-light">
            <a class="navbar-brand" href="#">首页</a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
            </button>
        
            <div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                <a class="nav-link" href="#">我的 <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                <a class="nav-link" href="#">设置</a>
                </li>
                <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-expanded="false">
                    更多
                </a>
                <div class="dropdown-menu">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <div class="dropdown-divider"></div>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
                </li>
                <li class="nav-item">
                <a class="nav-link disabled">退出</a>
                </li>
            </ul>
            </div>
        </nav>


        <form>
            <div class="form-group">
            <label for="exampleInputEmail1">账号</label>
            <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
            <!-- <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small> -->
            </div>
            <div class="form-group">
            <label for="exampleInputPassword1">密码</label>
            <input type="password" class="form-control" id="exampleInputPassword1">
            
            </div>
            <div class="form-group">
                <label for="exampleInputEmail1">选择登录</label>
                <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
                <!-- <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small> -->
            </div>
            <a class="btn btn-primary" href="#" role="button">登入</a>
            </div>
        </form>

        


        
        
    </div>
    

</body>
</html>